Means for protecting gas or vapor electric lamps.



PATENTED MAR. 3, 1903.

APPLICATION FILED JUNE 12, 1902.

N0 MODEL.

7: Noams vzYz'ns 00,. PHOTD-LIYHO.. WASHINGTON u. c.

UNITED STATES PATENT OFFICE.

STANWOOD E. FLIOHTNER, OF. ENGLEWOOD, NEW JERSEY, ASSIGNOR, BY

MESNE ASSIGNMENTS, TO COOPER HEWITT ELECTRIC COMPANY, A COR- PORATION OF NEW YORK.

MEANS'FOR PROTECTING GAS OR VAPOR ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 721,689, dated March 3, 1903.

Application filed June 12, 1902. Serial No. 111,243. (No model.)

T0 at whom, it may concern:

new and useful Improvements in Means for Protecting? Gas 'or Vapor Electric Lamps, of

which the following is a specification.

In view of the fact that the mercury contained in the Cooper Hewitt mercury-vapor lamp is practically unhindered by air-pres sure after the lamp is completed there exists considerable danger that the glass of the container will be fractured by the shock of the mercury during transportation. This danger exists especially at the sealing-off point, andthe mercury in these lamps and preventing,

fracture of the lamps at any point, a number of'such devices depending upon the peculiar placing of the seal-off.

Figures-1 and 2 of the drawings illustrate devices of this kind, while Fig. 3 represents the improved arrangement forming the subject-matter of the'present application, and Fig. 4 illustrates a modification. All the figures illustrate the lamps in the positions which they may well occupy when shipped, the operating positions being the reverse of those shown.

Ordinarily the seal-off has been located at the end of the bulb or condensing-chamber usually forming part of the Cooper Hewitt lamp, in which location it is especially exposed to shock from the shifting mercury when the lamps are in transportation. Accordingly it has been proposed to place the seal-off at one side of the bulb, as shown at 6 in Fig.1, or at one side of the main body of the lamp, as illustrated in Fig. 2 at 6'. In both these figures the main lamp-tube is shown at 1, the bulb or condensing-chamber at 4, the mercury at 5, the seal-0E at 6 or 6, and the leading-in wire for one of the electrodes at 8. In Fig. 3 I provide an additional chamber 10,

connected with the bulb 4 by a narrow neck 11. With the construction illustrated the lamp may be tipped or tilted to a considerable angle without excessive flow of mercury taking place and without any shock being likely to affect any part of the lamp. The chamber 10 may be connected with any part of the bulb 4, and the neck 11 may be formed into a spiral, as shown in Fig. 4, in which case the lamp might be transported lying on its side. I have indicated in Fig. 3 that the seal-off may be located either at 6 or at 6,as the case may be. In fact, the seal-0E may be located in any convenient position without being exposed to danger of fracture when the special pocket 10 is provided, as already described.

At the opposite end of each of the lamps shown in Figs. 1 and 2 I Show a wire 7, leading to an electrode 2. The latter may be of pure iron or of any other suitable substance, serving as the positive electrode of the lamp. I'prefer, however, to make both electrodes of mercury, in which case it is convenient to arrange the positive electrode at the upper end of the lamp during operation, the overflow of mercury finding its way into contact with the leading-in wire 8 at the bottom of the lamp and serving as the negative electrode.

An additional advantage appertaining to the form of protecting device herein described is that by reason of the presence of the neck connecting the auxiliary chamber with the bulb the protecting device can' be readily sealed ofi after reaching its destination, and the lamp can then be operated in the usual way without presenting any unusual appearance.

I claim as my invention- 1. In a gas or vapor electric lamp, the com-' was one or both of the electrodes, of a bulb or with the bulb, for containing the mercury condensing-chamber at one end of the lamp, during transportation. and a chamber connected by a neck with the Signed at New York, in the county of New bulb,for containing the mercury during trans- York and State of New York, this 7th day of 5 portation. June, A. D. 1902.

3. In a gas or vapor electric lamp, the com 1 V bination withalamp-tube containing mercury STANWOOD FLIOIITNER' as one or both of the electrodes, of a bulb or Witnesses: condensing-chamber at one end of the lamp, WM. I-I. CAPEL, 10 and a chamber connected by a spiral neck GEORGE I-I. STOCKBRIDGE. 

